This is a project I am finishing up on. I made many of the elements in raster and imported them through [Inflate Image]. The mermaid legs were done using the [Create Line] tool. The body was imported as an OBJ, Chopped up and [Cap Holes] so that I could position the arms easily. The arms were then welded back together and smoothed. The hair was sculpted in blender.

I found the masking tools [Angle] [Distance] [Angle, Distance] and [Limit] to be very good. I used them to select some of the flat objects and twist and raise or lower things and they work very well.